Y didnt u tell me u was buildin one? hopefully ill have more than 1 bot at nottingham, kinda unlikely but at least u can have a play if i do.
Ill list a few places for parts on here incase sumone can use it sometime.
These are some of the websites that you might use:
http://www.fightingrobots.co.ukwww.fightingrobots.co.uk (Look in for sale section or post in the wanted section)
http://www.xbotz.comwww.xbotz.com (Motors, Speed controllers, Batteries and other services)(unsure what hes got now tho)
http://www.technobots.co.ukwww.technobots.co.uk (pretty much everything you need)
http://www.ebay.co.ukwww.ebay.co.uk (You never know what your going to find here)

Right let me try help you find some bits that might help you. ill list things that you will be usefull on a cheap build.

(Motors, Gearboxes, Batteries, Chargers.)
Buy 2 or 4 (depending how many drive wheels you want) Cheap 9.6v cordless drills like these Challenge drills from Argoshttp://www.argos.co.uk/static/Product/partNumber/7110333/c_1/1%7Ccat_9554618%7CDIY+power+tools%7C9554865/Trail/searchtext%3ECHALLENGE.htmhttp://www.argos.co.uk/static/Produc...at_9554618%7CD IY+power+tools%7C9554865/Trail/searchtext%3ECHALLENGE.htm . These will supply you with Motors With already attatched gearboxes, Batteries and chargers.
This might be helpful to you if you go with the drills.http://www.robowars.org/wikka/DrillHacking101http://www.robowars.org/wikka/DrillHacking101

(Wheels)
Email james james@robochallenge.co.uk he sells 100mm or 75mm wheels that screw onto the drill motors with no modifications. or make your own

(LED, Wire, Removeable Links)
All of these items can be found at http://www.technobots.co.ukwww.technobots.co.uk or go somewhere like maplin for the wire and LED and buy some connectors like the Andersons powerpole connectors and make a removeable link yourself.

(Speed Controllers)
You can pick up cheap ones on http://www.ebay.co.ukwww.ebay.co.uk just check they are a high enough Voltage and Amp rating. Or make your own Using servos and switches(very rough but can be done).

(Radio Gear)
Ebay is the cheapest option but make sure its 40MHz Yo could get 2.4GHz but you wont need that. or http://www.technobots.co.ukwww.technobots.co.uk

(Armour, Chassis)
Decide what your robot is going to be like first, Steel, Aluminium, Polycarbonate, HDPE, Allsorts can be used so when you decide what material you want we can help you locate it.


This forum is a great place to find parts for your robot just create a thread in the wanted section. sombody will have summot that you need. Your will get some right bargains on here and if you ask nicely people might be able to get you offcuts for your armour and stuff.

ohh and btw i dont know what the hell im talking about... a professional will come and help you later. or just read through the forums like Gary said.